/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraSystemViewModel.h
Adds an empty emitter to the system.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FNiagaraEmitterHandleViewModel](API\Plugins\NiagaraEditor\ViewModels\FNiagaraEmitterHandleViewModel) > AddEmptyEmitter()